That is a big ask, but I’m game.
I’ve talked a bit about it here, here, and here.
Scott and Jean are tricky, because so much of their early relationship was very grounded in a particular kind of 50s Romance Comic dynamic where Angst and Not Talking About Feelings reigned, and then they became the It Couple because Jean was the only female member of the 05. And then there was the Scott-Jean-Logan love triangle they tried for a while, and then we got the Phoenix Saga (which was all about Scott and Jean as Doomed Lovers), and then Jean was the Lost Love, and then she came back so they became Destined To Be Together, and there was the Evil Ex/Clone, the Time-Travelling Baby, and on and on…
What I’m getting at is that that’s a LOT of dramatic weight being thrown onto their relationship which is about their relationship, without giving them much time just to be a couple. Part of this has to do with the fact that Marvel writers seem to have a problem writing married couples – one of the reasons I’ve been enjoying Slott’s Renew Your Vows is that it’s a rare book which understands that marriage and kids are the springboard for story not the end of it – so they keep adding Relationship Drama as the plot of last resort.

Scott and Emma were, to be honest, one of the most interesting things that had been done with those characters in a long time, and their relationship had enough juice to run for ~20 years. Indeed, I think it could have gone on longer had Jean not been killed off AGAIN (another source of cheap drama in comics) and if they hadn’t gone down the same road with Scott and Emma that culminated with Scott dying and Emma going crazy/evil.
Jean and Logan has some interesting Romance Novel dynamics, and I would be interested in seeing someone take a “Renew Your Vows”-style (although interestingly Jean and Logan are together and have a kid in that AU) take at them having a relationship, although it’s limited by them being in a triangle where the authors see Scott and Jean as the OTP.
However, I’ve said for a while on Twitter that the Scott-Jean-Logan triangle would be much more interesting (and funnier) if it was really about Jean coming into her sexuality (without having to be killed off) and wanting a poly relationship but being really bad at it.